<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    
</body>
<script>
    /**
     * 直接访问
     * 1.document.getElementById("id属性");
     * 2.document.getElementByClassName("class属性值");
     * 3.document.getElementsBytagName("标签名");
     * 节点关系
     * node.children  node.parentNode
     * 
     * node.firstElementChild  node.lastElementChild
     * 
    */
</script>
</html>